hamburg-magazin.de

Checked 21 October 2026, 22:41 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 failed 5 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

info

dufdns.work.de, ns.duf.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dufdns.work.de, ns.duf.de
NS in the zone
dufdns.work.de, ns.duf.de
NameserverAddressesNetwork (AS)Glue
dufdns.work.de87.253.160.162 2a00:ea8:100:c::2AS9211 WORK-AS - Nawork Internet Informationssysteme GmbH, DE AS9211 WORK-AS - Nawork Internet Informationssysteme GmbH, DE-
ns.duf.de192.166.181.180 2a00:e68:14:905::80AS9007 DUF-AS - heise & dumrath medien geschaeftsfuehrung gmbh, DE AS15743 NETDE - net.de AG, DE192.166.181.180 2a00:e68:14:905::80

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dufdns.work.de, ns.duf.de.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS15743 (NETDE - net.de AG, DE): 1 address; AS9007 (DUF-AS - heise & dumrath medien geschaeftsfuehrung gmbh, DE): 1 address; AS9211 (WORK-AS - Nawork Internet Informationssysteme GmbH, DE): 2 addresses.
  • i
    All nameserver names under .de
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dufdns.work.de 87.253.160.162NOERROR, 10 ms, authoritativenoyes / yesrefuseddns
dufdns.work.de 2a00:ea8:100:c::2NOERROR, 10 ms, authoritativenoyes / yesrefuseddns
ns.duf.de 192.166.181.180NOERROR, 11 ms, authoritativenoyes / yesrefusedbind9
ns.duf.de 2a00:e68:14:905::80NOERROR, 12 ms, authoritativenoyes / yesrefusedbind9

Checks

  • ✓ All respond #14
    All 4 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dufdns.work.de: "dns"; ns.duf.de: "bind9".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026073005 · primary ns.duf.de

Found

Primary (MNAME)
ns.duf.de
Contact (RNAME)
administrator.duf.de
Serial
2026073005
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dufdns.work.de (87.253.160.162)2026073005
dufdns.work.de (2a00:ea8:100:c::2)2026073005
ns.duf.de (192.166.181.180)2026073005
ns.duf.de (2a00:e68:14:905::80)2026073005

Checks

  • ✓ Serial 2026073005 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.duf.de is one of the listed nameservers.
  • ✓ Contact administrator@duf.de #25
    The SOA RNAME administrator.duf.de means administrator@duf.de.
  • ✓ Date-based serial #26
    The serial 2026073005 follows the YYYYMMDDnn convention (2026-07-30).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

11 records at the apex

Found

Read from
87.253.160.162:53
TypeValueTTL
SOAns.duf.de. administrator.duf.de. 2026073005 10800 3600 604800 36003600
NSns.duf.de.86400
NSdufdns.work.de.86400
A192.166.180.1493600
MX10 mx01.hornetsecurity.com.86400
MX30 mx03.hornetsecurity.com.86400
MX40 mx04.hornetsecurity.com.86400
MX20 mx02.hornetsecurity.com.86400
TXT"v=spf1 a mx ip4:193.99.145.50 ip6:2a00:e68:14:800::19:19 include:spf.hornetsecurity.com -all"1800
TXT"MS=ms55723666"3600
CAA0 issuewild "letsencrypt.org"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1d, NS 1d.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org.